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Related Experiment Video

Updated: Jun 28, 2025

High Resolution Physical Characterization of Single Metallic Nanoparticles

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

Active osmoticlike pressure on permeable inclusions.

Mahmoud Sebtosheikh^1,2, Ali Naji^1,3

¹School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran 19538-33511, Iran.

Physical Review. E

|April 18, 2024

Summary

Active fluids generate osmotic-like pressure on hollow inclusions. Pressure is higher in regions with lower particle motility due to particle accumulation, impacting membrane dynamics.

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Area of Science:

Soft matter physics
Statistical mechanics
Active matter systems

Background:

Active fluids exhibit unique emergent behaviors not seen in passive systems.
Understanding pressure generation in active matter is crucial for designing micro- and nanodevices.

Purpose of the Study:

Investigate the osmotic-like effective pressure exerted by active fluids on hollow inclusions.
Analyze how particle motility differences and system parameters influence this pressure.

Main Methods:

Utilized a minimal active Brownian model.
Simulated interactions within hollow inclusions with permeable membranes and differing internal/external motility strengths.
Analyzed steady-state effective pressure under varying conditions.

Main Results:

Effective pressure is higher in regions with lower active particle motility.
This pressure difference arises from stronger particle accumulation in low-motility zones.
System parameters like excluded volume and membrane hardness modulate pressure.

Conclusions:

Active fluids generate anisotropic pressure fields around inclusions.
Motility gradients are key drivers of pressure differences, offering potential for active control.